CN102821486A - WLAN (wireless local area network) anti-jamming method - Google Patents
WLAN (wireless local area network) anti-jamming method Download PDFInfo
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- CN102821486A CN102821486A CN2012103399796A CN201210339979A CN102821486A CN 102821486 A CN102821486 A CN 102821486A CN 2012103399796 A CN2012103399796 A CN 2012103399796A CN 201210339979 A CN201210339979 A CN 201210339979A CN 102821486 A CN102821486 A CN 102821486A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000003044 adaptive effect Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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Abstract
The invention provides a physical layer based WLAN (wireless local area network) anti-jamming method which is simple in principle, channel-resource-saving and strong in adaptive capacity to environment. A directionally-suppressed radiating antenna is adopted, and the radiating suppression direction of the directionally-suppressed radiating antenna faces an interference source. According to the invention, an improvement on the radiation direction is performed based on an antenna radiation pattern, and an antenna with a directional radiating suppression characteristic is adopted for replacing an omnidirectional antenna used by common wireless access points, thereby realizing the IEEE802.11 b effective confrontation on the interference of same channels or adjacent channels; and the method is simple and easy to operate, and has great practical values.
Description
Technical field
The invention belongs to wireless communication field, be specifically related to the WLAN Anti-Jamming Technique.
Background technology
In recent years, WLAN is because to have a cost low, networking flexibility, and the speed advantages of higher, and be widely used in home network and the public place network.Except the free WLAN of throwing in " hotspot " of individual, " hotspot " of charge also placed by telecom operators in some public places that the crowd is dense, and can predicting in the near future, wireless lan signal will almost cover each corner.
WLANPhysical layer has defined the signal characteristic and the modulation of transfer of data, has defined two RF transmission methods and an infrared transmission method, and the RF transmission standard is FHSS and DSSS, is operated in 2.4000～2.4835GHz frequency range.The IEEE802.11b standard of extensive use at present adopts the Direct swquence spread spectrum mode to be operated in 2.4GHz, takies the 83.5MHz bandwidth altogether, supports the flank speed of 11Mbps.
At present, " hotspot " mainly thrown in telecom operators during WLAN in public places covers is main, and how tame the WLAN of operator coexistence phenomenon be very general in many public arenas.Because environmental limit, the WLAN base station antenna of how tame operator must lean on very closely, and this has caused on the 2.4GHz frequency band interference phenomenon very serious.According to the relevant regulation of IEEE 802.11b and country; WLAN has 13 subchannel; This 13 subchannel mutual superposition, have only three frequencies be do not have each other overlapping, in the public place of multi-user and many hotspot unavoidable can occur with frequently or even cochannel disturb.Be meant in the WAP working range with frequency or cochannel interference, because other WAPs are operated in identical channel or the adjacent interference that channel caused.Under the situation of cochannel or adjacent-channel interference; WAP detects working band and is taken by other people; Collision detection mechanism according to IEEE 802.11b; To produce a random back stand-by period automatically, this will cause the regular entering of WAP to be kept out of the way, and greatly reduce to insert and transmission rate.Because IEEE 802.11b uses identical frequency expansion sequence sign indicating number, this cochannel or adjacent-channel interference intensity are big, and longer duration, and is serious to the throughput of system performance impact.
The interference that existing many methods are used to resist this cochannel or adjacent channel; Comprising the antenna distance that increases two adjacent WAPs as far as possible; And avoid the use of from the network layer algorithm as far as possible and exist with frequently or the adjacent frequency band that disturbs frequently, various forms of technology mainly all are that the parameters such as distance and operating frequency of coordinating two different radio access points realize.
Be applied to the WLAN antagonism now and also have many shortcomings with frequency or the adjacent patented technology of disturbing frequently, wherein maximum shortcoming is to fail to adapt to the demand of practical application.In the practical application of WLAN, the position that the WAP antenna can be arranged is limited, realizes that through the position of planning antenna the method that reduces interference is difficult to use.In addition; Avoid existing frequently same or adjacent frequency to disturb the method for operating frequency extra software to be installed through the Control Network layer at user side; Unrealistic, and cause a part of working frequency range to fail to be used, also wasted band resource after bringing inconvenience for user and operator.
Summary of the invention
The present invention provide a kind of based on physical layer, principle is simple, practice thrift WLAN anti-interference method channel resource, that adaptive capacity to environment is strong.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of WLAN anti-interference method is provided, adopts the directed radiating antenna that suppresses, the directed radiation that suppresses radiating antenna suppresses direction towards interference source.
Further, the said directed radiation inhibition direction that suppresses radiating antenna is the more weak direction of radiation field of aerial.
Compared with prior art; Beneficial effect is: the present invention is based on radiation pattern; Radiation direction is improved, and the omnidirectional antenna that adopts the antenna with directed radiation suppression characteristic to replace general WAP to use realizes that IEEE 802.11b effectively resists cochannel or adjacent-channel interference; And simple, have huge practical value.
Description of drawings
Fig. 1 is an overall schematic of the present invention;
Fig. 2 a is the omnidirectional antenna sketch map;
Fig. 2 b is an omnidirectional antenna antenna pattern horizontal direction sketch map;
Fig. 2 c is an omnidirectional antenna antenna pattern vertical direction sketch map;
Fig. 3 a is the directed radiating antenna sketch map that suppresses;
Fig. 3 b is the directed radiating antenna antenna pattern horizontal direction sketch map that suppresses;
Fig. 3 c is the directed radiating antenna antenna pattern vertical direction sketch map that suppresses;
Fig. 4 a is the WLAN downstream rate test result sketch map under the adjacent-channel interference;
Fig. 4 b is a WLAN downstream rate test result sketch map behind employing the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done to specify further.
With reference to Fig. 1, when the omnidirectional antenna of a standard and the directed radiating antenna that suppresses are placed on about 5 meters distance on the horizontal plane; With reference to Fig. 2 and Fig. 3, the radiation inhibition direction (depression direction) that orientation is suppressed radiating antenna is an omnidirectional antenna towards interference source, and the access point that just can make frequent entering collision detection keep out of the way recovers operate as normal.
Fig. 4 is the test result of this embodiment, and the WLAN downstream rate under cochannel or the adjacent-channel interference is lower, adopted here the WLAN anti-interference method after speed of download be greatly improved, realized jamproof function.
The above is merely an instance of the present invention; Be not so limit claim of the present invention; Every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (2)
1. a WLAN anti-interference method is characterized in that, adopts the directed radiating antenna that suppresses, and the directed radiation that suppresses radiating antenna suppresses direction towards interference source.
2. WLAN anti-interference method according to claim 1 is characterized in that, it is the more weak direction of radiation field of aerial that the said directed radiation that suppresses radiating antenna suppresses direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103399796A CN102821486A (en) | 2012-09-14 | 2012-09-14 | WLAN (wireless local area network) anti-jamming method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012103399796A CN102821486A (en) | 2012-09-14 | 2012-09-14 | WLAN (wireless local area network) anti-jamming method |
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| CN102821486A true CN102821486A (en) | 2012-12-12 |
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| CN2012103399796A Pending CN102821486A (en) | 2012-09-14 | 2012-09-14 | WLAN (wireless local area network) anti-jamming method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726221A (en) * | 2020-01-06 | 2020-09-29 | 电子科技大学 | Physical layer safety transmission method capable of resisting arbitrary eavesdropping antenna number |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101473556A (en) * | 2006-06-19 | 2009-07-01 | 五月花通讯股份有限公司 | Antijam filter system and method for high fidelity high data rate wireless communication |
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2012
- 2012-09-14 CN CN2012103399796A patent/CN102821486A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101473556A (en) * | 2006-06-19 | 2009-07-01 | 五月花通讯股份有限公司 | Antijam filter system and method for high fidelity high data rate wireless communication |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111726221A (en) * | 2020-01-06 | 2020-09-29 | 电子科技大学 | Physical layer safety transmission method capable of resisting arbitrary eavesdropping antenna number |
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Application publication date: 20121212 |